Excel Formula Optimisation

Question

I am no excel expert and after some research have come up with this formula to look at two sets of the same data from different times. It then displays new entries that are

Answer 1

A relatively fast solution is to add a multi-cell array formula in a column alongside List 2

{=MATCH($A$1:$A$16,List1!$A$1:$A$11,0)}

and filter the resultant output for #N/A.

(Or see Compare.Lists vs VLOOKUP for my commercial solution)